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The squeaking could be from the steam during the brew cycle. My first suggestion would be to wait a couple of minutes after the brew cycle has finished (after you enjoy your first, delicious cup) then open the cover. If you notice any warping or if the problem persists call Cuisinart directly.

Have you tried backwashing, then removing the shower and screen from the grouphead to make sure that there is no coffee buildup on the screen.As for the leak around the portafilter, the group gasket needs to be replaced,

After I posted this I decided to descale the machine again, even though I'd just done it a couple of weeks ago. After descaling and rinsing I tried running water through the brew group by pressing the pre-ground button, then holding down the big cup button. Still no water, but then I turned the little knob on the coffee dispenser counterclockwise, about half a turn. It worked! I rinsed it well, then made a cup of delicious espresso.